The future-alone participants made fewer cooperative moves than did participants in other conditions, F(2, 28) = 5.87, p < .01. Tukey's HSD tests showed that the future-alone condition was significantly different from the other two conditions at p < .05 and that the future-belonging and no-feedback-control conditions were not significantly different from each other. Comparing the future-alone group with the other two groups yielded d = 1.31, a large effect. These results suggest that socially excluded individuals are still less prosocial than are others, even when their ostensible partner starts off by cooperating. 1. What kind of study design is this (experimental or correlational)? 2. If experimental, what is the independent variable?